Ethylene and hydrogen sulphide are essential for mitigating hexavalent chromium stress in two pulse crops. (7th September 2021)

• Record Type: Journal Article
• Authors: Husain, T.; Suhel, M.; Prasad, S. M.; Singh, V. P.
• Editors: Siddiqui, M. H.
• Is Part Of: Plant biology. Volume 24:Number 4(2022)
• Page Start: 652
• Page End: 659
• Publication Date: 2021-09-07
• Subjects: ethylene -- hydrogen sulphide -- oxidative stress -- proline metabolism -- sulphur assimilation; Botany -- Periodicals; Plants -- genetics -- Periodicals; Plants -- growth & development -- Periodicals; Plant Proteins -- Periodicals; Gene Expression Regulation, Plant -- Periodicals; Botanique -- Périodiques; 580
• DOI: 10.1111/plb.13324
• Languages: English
• ISSNs: 1435-8603

Abstract

Abstract: Chromium toxicity to crops is a major scientific problem of the present time. Thus, scientific attempts have been made for reducing chromium toxicity to crop plants. In this study, we examined the potential of ethylene (ET, 25 µM) and hydrogen sulphide (H2 S, 10 µM) to alleviate hexavalent chromium [Cr(VI), 50 µM] stress in two pulse crops, black bean and mung bean, by assessing physiological and biochemical attributes. Cr(VI) reduced shoot and root length in black bean and mung bean in comparison to the control. Plants had increased accumulation of oxidative stress markers, i.e . superoxide radicals (SOR), hydrogen peroxide (H2 O2 ) and lipid peroxidation (as malondialdehyde, MDA). The addition of AVG (an inhibitor of ET biosynthesis) and PAG (an inhibitor of H2 S biosynthesis) to Cr(VI)‐treated plants further increased Cr(VI) toxicity, suggesting their endogenous levels are important for tolerating Cr(VI) toxicity. However, supplementation with either ET or H2 S alleviated Cr(VI) toxicity. Interestingly, ET did not rescue negative effects of PAG under Cr(VI) stress but NaHS rescued negative effect of AVG. Overall, results indicate that, although both ET and H2 S alleviate Cr(VI) stress, endogenous H2 S is better. Furthermore, H2 S appears to be a downstream signal for ET in alleviating Cr(VI) stress in these two pulse crops Abstract : Though ethylene and hydrogen sulfide both are able in alleviating Cr(VI) stress in studied pulse crops but endogenous hydrogen sulfide is necessary in accomplishing this task